Not syllabled; not articulated, uttered, or pronounced; not divided into syllables.
The Century Dictionary (Public Domain)
Use "unsyllabled" in a sentence
"Then ensued a wild and terrible commingling of unsyllabled sounds, so unearthly that it is not in the power of language to fitly describe them."
"Fit names are not given, but grow; and we believe there is not a spot in the land, possessing any attractiveness, but has its name ready fitted to it, waiting unsyllabled in the air above it for the right sponsor to speak it into life."
"And the mountains smiled not, neither wept, but gravely and kindly folded over, about, behind, the gray mantle of the cañon walls, and locked fast doors of adamant against all following, and swept a pitying hand of shadow, and breathed that wondrous unsyllabled voice of comfort which any mountain-goer knows."